EN
In the years of 2011-2012 in the Research Institute of Horticulture, Department of Genetics, Breeding and Biotechnology of Vegetable Crops, Skierniewice, Poland, an analysis of four malesterile and six male-fertile head cab-bage (Brassica oleracea var. capitata f. alba) lines was performed both in generative and vegetative stage. In 2011 the ability for generative propagation and the level of self-incompatibility was analyzed, then in consecutive season, the evaluation of morphological and commercial characters as well as the level of internal uniformity was done. The tested lines were diversified according to the ability of generative propagation and self-incompatibility level. The evaluation in vegeta-tive stage showed the high and intermediate level of internal uniformity. Tested lines were diversified according to the yield, earliness, morphological characters and susceptibility for major diseases and pests of head cabbage. The evaluated head cabbage population can be useful for the breeding purposes after homozygotization and selection toward self-compatibility traits.